title: Free thyroxine: a comparison of direct and indirect methods and their diagnostic usefulness in nonthyroidal illness.
mesh_terms: D006801:Humans; D008722:Methods; D012016:Reference Values; D013959:Thyroid Diseases / Q000097:blood; D013963:Thyroid Hormones / Q000097:blood*; D013974:Thyroxine / Q000097:blood*; D013975:Thyroxine-Binding Proteins / Q000032:analysis
chemical_list: D013963:Thyroid Hormones; D013975:Thyroxine-Binding Proteins; D013974:Thyroxine